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The System Sensor WFD Series vane-type waterflow detector,with a computer designed paddle, fits Schedule 10 throughSchedule 40 steel pipe sizes 2through 8. The design of thisunit makes it easy to install and simple to maintain. It can bemounted in a vertical or horizontal position and is suitable forindoor and UL-listed outdoor wte-pipe sprinkler installations.Switch assembly and delay mechanism assembly are fieldreplaceable.